3 speed transmission swap?

[koeneke2005]

I was thinking about swapping my T-150 3 speed with a T-18 4 speed. Question is will the 4 speed run lower rpms at highway speeds than the 3 speed does.

 

[csuengr]

T-150 has a 1:1 third gear. T-18 has a 1:1 fourth gear. Same rpm's.

 

[73CJ]

When stuck I like to rock it.

That's pretty hard to do that with a four speed.

 

[Saddle Tramp]

Although the cases are obviously different between the T-150 and the T-18 the transmissions are basically the same as far as usability and service except the T-18 comes with the granny low. (2 different granny low gear ratios available, 4.01 & 6.32) As your jeep is a 1979 the bell housing is drilled and taped for both the Ford “butterfly” Transmission pattern (T-150 ) and the CJ T-18 . This lets you use either a CJ T-18 or a Ford T-18 for the transplant. Also the 1979 CJ frame is drilled and tapped for either the T-150 or the T-18 as well. For the T-150 the front bolt holes in the skid plate lines up with the front holes in the frame while for the T-18 the back holes in the skid plate line up with the back set of holes in the frame, leaving an extra set of holes at one end or the other. Here are a couple of links to check out:

http://www.jeeptech.com/convtrans/cjt18/

http://www.jeeptech.com/convtrans/fordt18/index.html

 

[dagr8tim]

Not to thread jack, but what about an AX15?

Currently I have a T-14 /T-15 (not sure which) and would love to go to a 5 speed.

 

[Airstrike]

Although the cases are obviously different between the T-150 and the T-18 the transmissions are basically the same as far as usability and service except the T-18 comes with the granny low. (2 different granny low gear ratios available, 4.01 & 6.32) As your jeep is a 1979 the bell housing is drilled and taped for both the Ford “butterfly” Transmission pattern (T-150 ) and the CJ T-18 . This lets you use either a CJ T-18 or a Ford T-18 for the transplant. Also the 1979 CJ frame is drilled and tapped for either the T-150 or the T-18 as well. For the T-150 the front bolt holes in the skid plate lines up with the front holes in the frame while for the T-18 the back holes in the skid plate line up with the back set of holes in the frame, leaving an extra set of holes at one end or the other. Here are a couple of links to check out:

http://www.jeeptech.com/convtrans/cjt18/

http://www.jeeptech.com/convtrans/fordt18/index.html

I am doing a CJ AMC 150 to a CJ T18A swap atm ... the link you posted is priceless.... thanks for the info SaddleTramp!!